Technical Tip: ARP IP address is not visible in the GUI -> Users & Devices -> Devices Inventory

[tonylin1]

Description	This article describes why the ARP IP address is not visible in the GUI -> Users & Devices -> Devices Inventory.
Scope	FortiGate.
Solution	Sometimes it only shows the MAC address without the IP address of a device in the Devices Inventory. But there is an IP address record in the ARP table for that MAC address 70:4c:a5:ea:0f:4a. diagnose ip arp list | grep 4a index=17 ifname=port17 10.1.212.21 70:4c:a5:ea:0f:4a state=00000002 use=178 confirm=321 update=5855151 ref=3 To make that MAC address have an IP address as seen in the example below: 10.1.212.18 => 70:4c:a5:ea:06:07. Set up a local DHCP server on FortiGate to assign an IP address for the device, The Device inventory can extract the IP address from the DHCP lease info. If the issue persists after this, execute the command below after hours: diagnose user device clear  diagnose user device list  After that, check the GUI to see whether the IP address can be seen, if not, execute the below command after hours: diagnose test wad 99  fnsysctl killall cid